What does it mean when my First Alert Onelink combination Smoke and Carbon Monoxide alarm keeps chirping?

It is likely that the reason your smoke alarm keeps chirping and beeping is that the battery is low and your product has reached the end of its life. Fiver (5) chirps indicates the End of Life. If your product is in End of Life mode, replace the alarm immediately. If you hear three (3) chirps, this could mean the alarm is in a malfunction mode. If your alarm is in malfunction mode please contact customer support to help troubleshoot. Other reasons your alarm may be chirping are as follows:

A different device or appliance such as a security system, monitor, carbon monoxide alarm, or other device which has a similar low battery or alert signal.

Some of the same factors that cause unwanted alarms can cause intermittent alarms: dust and insects in the alarm or power interruptions in hardwired alarms.

Improper wiring on AC or AC/DC smoke alarms. AC alarms will chirp every 5 seconds if the interconnect wire is grounded. The orange interconnect wire should NEVER be grounded; it should only be used to interconnect other smoke alarms or compatible devices.

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First Alert has been protecting homes and families since 1958

First Alert began in 1958, when three friends set out to create a commercial smoke alarm. In the five decades since, we have continued to create innovative products, from the first residential smoke alarm to the first battery operated carbon monoxide alarm. By leading the home safety category through reliability, quality and innovation, we follow in the footsteps of our founders and make the world a safer place - one home, one family, one life at a time.